Roman would have pointed out it was frankly impossible to simply use 'Caster' to address him because it would be very confusing when there were other Servants of the same class in Chaldea. In these circumstances, concealing his identity was more trouble than it was worth.

"Eh--Excuse me but," he said, holding his hand up to wave some of the smoke away, "It's forbidden to smoke here." He would scold him about how bad that was for his health if he wasn't a Servant. "If you want, we can go to the smoking room or another area that allows it." The small greenhouse he made years ago for example. A change of setting would help the new arrival to become more familiar with the premises.

He scratched the back of his head. How should he answer that? "I'm just your run on the mill doctor, Lord El Melloi II," he reminded him - reminded himself as well- with the too familiar self-depreciation. "I'm only saying this in name of those who entrusted me with this temporary position."